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[Merged by Bors] - chore: adaptations for lean4#12976 #231

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[Merged by Bors] - chore: adaptations for lean4#12976 #231

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22 changes: 0 additions & 22 deletions Mathlib/Data/List/TakeDrop.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -88,28 +88,6 @@ theorem tail_iterate (l : List α) (n : ℕ) : (List.tail^[n]) l = l.drop n := b
| zero => rfl
| succ n ih => cases l <;> simp [*]

section TailDropLast

variable (l : List α) (n : ℕ)

theorem tail_take_eq_take_tail : (l.take n).tail = l.tail.take (n - 1) := by
ext
grind

theorem dropLast_take_eq_take_dropLast : (l.take n).dropLast = l.dropLast.take (n - 1) := by
ext
grind

theorem tail_drop_eq_drop_tail : (l.drop n).tail = l.tail.drop n := by
ext
grind

theorem dropLast_drop_eq_drop_dropLast : (l.drop n).dropLast = l.dropLast.drop n := by
ext
grind

end TailDropLast

section TakeI

variable [Inhabited α]
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